I'll chip in if it contains the unregistered ones in there.

I'd trade my flat for all transactions involving everyone in the medical field (in UK) for the past 4 years(including relatives and friends). If only location data is available... I'll do with that.

This is actually a great hacktivism idea! It could include all influential people who are enablers of today's system, such as regulators and politicians.

Is it legal to publicly disclose this data, or is it only legal to collect and sell it?

The one potential obstacle is that the shady 3p data brokers might refuse to sell it if they smell the purpose.

I'd also like full location data for all the politicians who allow this to happen. US three letter agency employees. All powerful people in general.

I would actually chip in fairly seriously for this!

to lobby for what